25654923974789 has 2 divisors, whose sum is σ = 25654923974790. Its totient is φ = 25654923974788.

The previous prime is 25654923974699. The next prime is 25654923974809. The reversal of 25654923974789 is 98747932945652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18185252349889 + 7469671624900 = 4264417^2 + 2733070^2 .

It is a cyclic number.

It is not a de Polignac number, because 25654923974789 - 2²⁸ = 25654655539333 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25654923974489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12827461987394 + 12827461987395.

It is an arithmetic number, because the mean of its divisors is an integer number (12827461987395).

Almost surely, 2^{25654923974789} is an apocalyptic number.

It is an amenable number.

25654923974789 is a deficient number, since it is larger than the sum of its proper divisors (1).

25654923974789 is an equidigital number, since it uses as much as digits as its factorization.

25654923974789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8230118400, while the sum is 80.

The spelling of 25654923974789 in words is "twenty-five trillion, six hundred fifty-four billion, nine hundred twenty-three million, nine hundred seventy-four thousand, seven hundred eighty-nine".